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dsp 6678多核boot问题

Other Parts Discussed in Thread: UCD9222

    我现在在程序固化之前将6678的拨码开关SW3,SW4,SW5,SW6设置成1000 0000 0000 1100(看了下资料,SPI nor flash固化之前需要将拨码开关设置如此),用CCS5.5在线调试程序,让程序全速运行,每次运行一段时间后就会出现:Error:connect to PRSC failed。而将拨码快关SW3,SW4,SW5,SW6设置成其他模式不会出现这种问题,请问可能是什么问题那?怎么排查?